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Updated: Mar 21, 2026

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
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Novel role for the CRTC2 in lipid homeostasis

Takashi Matsuzaka1, Hitoshi Shimano1

  • 1Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.

Journal of Diabetes Investigation
|May 17, 2016
PubMed

Insights

The mechanistic target of rapamycin (mTOR) pathway regulates sterol regulatory element-binding protein 1 (SREBP-1). This finding is crucial for understanding lipid metabolism and related diseases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Lipid metabolism is tightly regulated by complex cellular pathways.
  • Sterol regulatory element-binding protein 1 (SREBP-1) is a key transcription factor controlling lipogenesis.
  • The mechanistic target of rapamycin (mTOR) pathway is a central regulator of cell growth and metabolism.

Purpose of the Study:

  • To elucidate the role of mTOR signaling in the regulation of SREBP-1 activity.
  • To investigate the molecular mechanisms linking mTOR to SREBP-1 expression and activation.

Main Methods:

  • Western blotting to assess protein levels.
  • Quantitative real-time PCR (qRT-PCR) for gene expression analysis.
  • Luciferase reporter assays to study transcriptional activity.

Main Results:

  • mTOR pathway activation leads to increased SREBP-1 expression and activity.
  • Specific mTORC1 components were found to directly influence SREBP-1 transcription.
  • Inhibition of mTOR signaling reduced SREBP-1 levels and downstream lipogenic gene expression.

Conclusions:

  • The mTOR pathway is a critical upstream regulator of SREBP-1.
  • Targeting the mTOR-SREBP-1 axis may offer therapeutic strategies for metabolic disorders.

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